Geoid meaning

jē'oid'
The hypothetical surface of the Earth that coincides everywhere with mean sea level and is perpendicular, at every point, to the direction of gravity. The geoid is used as a reference surface for astronomical measurements and for the accurate measurement of elevations on the Earth's surface.
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A surface of constant gravitational potential at zero elevation.
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The hypothetical surface of the earth that coincides everywhere with mean sea level.
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In geodesy, the earth viewed as a hypothetical ellipsoid with the surface represented as a mean sea level.
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Origin of geoid

  • German from Greek geoeidēs earthlike earth -oeidēs -oid
    From American Heritage Dictionary of the English Language, 5th Edition